At this point I'm pretty confident that I'll pass the writing part, but the speaking part worries me, since I heard that such errors are significantly penalised. When I try to speak, I make quite a lot of article (der/die/das) and conjugation (weil du ... betreffen instead of betriffst/ zwingen bist instead of gezwungen bist) errors. I noticed that it occurs more with Nebensatz, where I essentially forget the subject at the end of the sentence. Is there any way to correct this quickly, besides just talking freely by myself and a few hours per week at speaking group?

I essentially learn German full-time at this point until the exam day if that helps, and it doesn't need to be any specific score, just passing is enough.